The anodic redox peak current (ipa) and cathodic redox peak current (ipc) together are known as the redox peak current (ip). If you are doing cyclic voltametry (CV) then you can easily find different redox peak currents at different scan rates (f). You just plot ip vs. f1/2 and if you find that it represents a straight line in the scan rate range, then from the theory of electrochemistry the process is said to be diffusion controlled.
In diffusion controlled processes, the higher is the scan rate, the higher is the peak current in CV. This is because, for higher scan rates, diffusion layer can not grow wider around the electrode resulting a fast electrolyte flux. For a lower scan rate, the diffusion layer grows wider reducing the electrolyte flux.
For a better idea, I suggest you read the below mentioned ACS article.
http://pubs.acs.org/doi/abs/10.1021/acssuschemeng.5b00519
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